design and simulation of a solar pv system - BRAC University ...

The figure 20 shows the designed solar system of BRAC University. This configuration
showing that there is one combiner connected with 36 PV module. 12 PV modules in
series in a string and there are 3 strings in parallel. For our system there would such 14
configuration.
The solar irradiance in Dhaka is 694.04 watt/day [ 5.2.2]. The energy supplied by the
solar PV system in a year can be found by the following formula.
Total energy supply = Maximum Power at defined irradiance of a solar panel *
Average bright sunshine hour * 365 days * total no. of solar
panels
= 173.51 * 7.55 * 365 * 492
= 235.249 MWh/year
Considering 80% of panel’s output efficiency the total energy supply = 188.39
MWh/year
The daily output energy is 515.62 kWh/day
7.0 Design simulation
For the PV system designed for BRAC University campus, we have chosen for
simulation is PVSYST software. PVSYST has several built-in mathematical models for
component such as photovoltaic module, inverter and other tools.
PVSYST gives two types of designing options as preliminary design and project design.
Using these options there are various kinds of system can be developed.
For preliminary design:
Grid connected system, stand alone and pumping – these three types of system can be
designed. Actually this is used to get a primary idea for users. There are three steps to
design a system like have to define location and system sizing (select PV module type,
technology, ventilation and mounting disposition). Then PVSYST will show users a
result for that system.
For project design:
This is more elaborate than preliminary design. There are many options to define
parameters for designing a project of different types of systems like grid connected /stand
alone /dc grid connected/pumping.
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